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Compound Microscope

A tank is fil...

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A tank is filled with water to a height of 12.5 cm. The apparent depth of a needle lying at the bottom of the tank is measured by a microscope to be 9.4 cm. What is the refractive index of water? why depth is measured by microscope?

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Q. A tank is filled with water to a height of 12.5 cm. The apparent depth of a needle lying at the bottom of the tank is measured by a microscope to be 9.4 cm. What is the refractive index of water? If water is replaced by a liquid of refractive index 1.63 upto the same height, by what distance would be microscope have to be moved to focus on the needle again?

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Q. If we fill a tank with water to a height of 12.5 cm, the apparent depth of a needle lying at the bottom of the tank is measured to be 9.4 cm. What is the refractive index of water?

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